The former Manchester United manager - who presided over the Frenchman's exit from Old Trafford in 2012 - gave the brutal put-down during a speech to players and staff from Sale Sharks rugby club.

Brian Mujati, a Sharks prop, videoed himself asking the Reds legend a question about why Pogba was allowed to join Juventus for next to nothing.

United bought the midfielder back for a world-record £89million last summer and Mujati asked: "Sir Alex, with all this coaching and analysis, why was no one able to acknowledge the undeniable talent that is Paul Pogba?"

Sir Alex, who has criticised Raiola previously, replied: "Paul Pogba? He had a bad agent. A s***bag.

"Paul Pogba was well known to us. We knew he was a good player. He's still a good player. We offered him the best contract..."